History
Procedural signs in Morse code are a form of control character.
A form of control characters were introduced in the 1870 Baudot code: NUL and DEL. The 1901 Murray code added the carriage return (CR) and line feed (LF), and other versions of the Baudot code included other control characters.
The bell character (BEL), which rang a bell to alert operators, was also an early teletype control character.
They have also been called "format effectors".
Read more about this topic: Control Character
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